Table 4
Intraobserver reliability expressed as the weighted kappa statistic for each pair of observers
| Weighted kappa statistic | Mean weighted kappa statistic for category | ||||
|---|---|---|---|---|---|
| For pair 1a v 1b (SE) | For pair 1a v 2b (SE) | For pair 3a v 3b (SE) | |||
| Round | 0.79 (0.0093) | 0.75 (0.0097) | 0.86 (0.0101) | 0.79 | |
| Oval | 0.86 (0.0065) | 0.86 (0.0066) | 0.90 (0.0068) | 0.86 | |
| Superior steepening | 0.99 (0.0055) | 0.99 (0.0055) | 0.98 (0.0054) | 0.99 | |
| Inferior steepening | 0.98 (0.0062) | 0.97 (0.0061) | 0.99 (0.0061) | 0.98 | |
| Symmetric bow tie | 0.96 (0.0069) | 0.92 (0.0072) | 0.96 (0.007) | 0.96 | |
| Symmetric bow tie with skewed radial axes | 0.99 (0.0051) | 1.0 (0.0051) | 0.99 (0.0051) | 0.99 | |
| Asymmetric bow tie with inferior steepening | 0.97 (0.0057) | 0.95 (0.0054) | 0.99 (0.0058) | 0.97 | |
| Asymmetric bow tie with superior steepening | 0.97 (0.0054) | 0.98 (0.0055) | 1.0 (0.0058) | 0.98 | |
| Asymmetric bow tie with skewed radial axes | 1.0 (0.0051) | 1.0 (0.0052) | 1.0 (0.0051) | 1.0 | |
| Irregular | 0.94 (0.0057) | 0.95 (0.0056) | 0.99 (0.0059) | 0.95 | |
| Median weighted kappa statistic for whole group | 0.97 | 0.95 | 0.99 | 0.97 | |
-
↵There were no maps classified by at least two observers in this category. The weighted kappa statistic is shown here to illustrate the low false positive rate for this category but it has not been used in determining the median weighted kappa statistic for the whole group.
